1 /* 2 * Copyright (C) 2014 Google, Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package dagger.internal.codegen.writer; 17 18 import dagger.internal.codegen.writer.Writable.Context; 19 import java.io.IOException; 20 import java.util.Iterator; 21 import java.util.Set; 22 23 final class Writables { 24 25 /** 26 * Joins the writables by the given delimiter, writing out the 27 * prefix & suffix if there's at least one element. 28 */ 29 static void join(String delimiter, Iterable<? extends Writable> writables, 30 String prefix, String suffix, 31 Appendable appendable, Context context) throws IOException { 32 Iterator<? extends Writable> iter = writables.iterator(); 33 if (iter.hasNext()) { 34 appendable.append(prefix); 35 iter.next().write(appendable, context); 36 while (iter.hasNext()) { 37 appendable.append(delimiter); 38 iter.next().write(appendable, context); 39 } 40 appendable.append(suffix); 41 } 42 } 43 44 /** Joins the writables by the given delimiter. */ 45 static void join(String delimiter, Iterable<? extends Writable> writables, 46 Appendable appendable, Context context) throws IOException { 47 join(delimiter, writables, "", "", appendable, context); 48 } 49 50 static Writable toStringWritable(final Object object) { 51 return new Writable() { 52 @Override 53 public Appendable write(Appendable appendable, Context context) throws IOException { 54 return appendable.append(object.toString()); 55 } 56 }; 57 } 58 59 private static final Context DEFAULT_CONTEXT = new Context() { 60 @Override 61 public String sourceReferenceForClassName(ClassName className) { 62 return className.canonicalName(); 63 } 64 65 @Override 66 public Context createSubcontext(Set<ClassName> newTypes) { 67 throw new UnsupportedOperationException(); 68 } 69 }; 70 71 static String writeToString(Writable writable) { 72 StringBuilder builder = new StringBuilder(); 73 try { 74 writable.write(builder, DEFAULT_CONTEXT); 75 } catch (IOException e) { 76 throw new AssertionError("StringBuilder doesn't throw IOException" + e); 77 } 78 return builder.toString(); 79 } 80 81 private Writables() { 82 } 83 } 84
